T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.

A204230

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.

Terms

    a(0) =81a(1) =450a(2) =450a(3) =2500a(4) =4539a(5) =2500a(6) =11100a(7) =44641a(8) =44641a(9) =11100a(10) =49284a(11) =312001a(12) =752562a(13) =312001a(14) =49284a(15) =192474a(16) =2173565a(17) =8183170a(18) =8183170a(19) =2173565a(20) =192474a(21) =751689a(22) =12097076a(23) =87487117a(24) =129062037a(25) =87487117a(26) =12097076a(27) =751689a(28) =2707641a(29) =67329896

External references